Influence of Mg and Si on Cluster Formation in Al-Mg-Si Alloys Studied by Positron Annihilation Lifetime Spectroscopy
Influence of Mg and Si on Cluster Formation in Al-Mg-Si Alloys Studied by Positron Annihilation Lifetime Spectroscopy
复制标题
正电子湮没寿命谱研究Mg和Si对Al-Mg-Si合金团簇形成的影响
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
J. Banhart
中科院分区：
文献类型：
--
作者：
Meng Liu;Y. Yan;Z. Liang;C. S. Chang;J. Banhart
研究了二元Al-Mg和Al-Si合金自然时效过程中正电子寿命的变化。实验结果表明，对于稀化合金，Al-Si合金的平均寿命在自然时效（NA）过程中比Al-Mg合金更快地下降到一个稳定的值，在相同溶质含量下，Al-Si合金的空位相关寿命组分也明显高于Al-Mg合金。对于溶质含量较高的合金，寿命的下降不明显。这说明Si增强了空位的跳跃频率，而Mg则能捕获空位并减缓空位的跳跃频率。
The change of positron lifetimes during natural ageing of binary Al-Mg and Al-Si alloys was characterized. The experiments show that for dilute alloys, the average lifetimes in Al-Si alloys decrease faster to a stable value during natural aging (NA) than in Al-Mg alloys and the vacancy-related lifetime components of Al-Si are also significantly higher than in Al-Mg alloys for equal solute content. For alloys with higher solute contents, the decrease of the lifetime becomes insignificant. This indicates that Si enhances the jump frequency of vacancy while Mg can trap vacancy and slow down the jump frequency of vacancy.